feat: implement My Courses page with a new CourseCard component and certificate download functionality, along with new Thai locale strings.

Frontend-Learner/pages/dashboard/my-courses.vue

@@ -168,6 +168,7 @@ const validCourseId = computed(() => {
           :progress="course.progress"
           :image="course.thumbnail_url"
           show-continue
+          :show-view-details="false"
         />
         <!-- Completed Course Card -->
         <CourseCard 
@@ -179,6 +180,7 @@ const validCourseId = computed(() => {
           :completed="true"
           show-certificate
           show-study-again
+          :show-view-details="false"
           :loading="downloadingCourseId === course.id"
           @view-certificate="downloadCertificate(course)"
         />